Apparatus for measuring the humidity in or determining the evaporating power of the air.



M. M. HASTINGS.

AIPARAITUS I'OR MEASURING THE HUMIDITY IN OR DETERMINING THE EVAPORATING OF THE AIR. APPLICATION IILI-ID 8EPT.22,1908.

\ i x I D 1 N LIulnuluulnuhH Patented Feb. 9, 1909.

. MT/VES Es INVENfO/P the humidity in, or determining the evapoa result, it. frequently occurs that operators meetthe needs of the cold storage industry.

perfected for determining the humidity in the invention will be more readily undering, forming a part hereof, wherein is shown the bottom thereof, and is attached at its bot- UNITED STATES PATENT" OFFICE.

9111.0 M. inis'rnvcs, or nis'rmo'i" or cot'uuini.

APPARATUS FOR MEASURING TEE HUMIDITY IN OLR DETERMINING THE EVAPORATING POWER OF. THE AIR.

No. 911,875. Specification of LettersPatentd Patented Feb. 9, 1909.

Application filed September 22,. 1 90 8. Serial No. 454,280.

.(DEDIGATED TO THE name.)

To all whom it may concern: a

Be it known that I, MILO M. HASTINGS, an employee'of the Department of Agriculture, and a legal resident. of the State of Kansas, at present residing in the city of \Vashington, District of Columbia, Whose post-oflicc address is No. 1733 Twentieth street northwest, in said city and District, have invented a new and useful Apparatus for .\[easuring the llumidity in or Determining the 'lfivaporating Power of theAir.

This application is made under the act of March 3. 1883, chapter 143 (22 Stat, 625), and the invention herein described and claimed may be used by the Government of the ,llnited States or any of its officers or enu iloyees in the prosecutioirof work for the (iOVQtIllllClll or by any person, in the United States, without payment to me of any royalty thereon.

This invention relates to atmospheric humidity and is adapted for use in; measuring tom end by means of cement to a. round glass tube H. The said glass tube H connects with a stop-cock, D, and is attached near its' center to the; glass tube E which runs merpendicularly with the scale, G, and is connected with a horizontal glass tube, If, of similar diameter, having an entrance to a glass tube, B, of larger circumference, which serves as a reservoir for retaining the fluid used in practicing my invention. The reservoir 13 has an opening at its top. (l, so as to permit the fluid to be poured therein. This openin (I, is closed by means of a check bulb K fitted into a rubber stopper, 1, and when placed ill the opening, 0, itallows freedom of air pressure Without permitting leakage of the liquid contained in. the reservoir. B. The reservoir, or larger glass tube, B, at its lower end, forn'lsa part of and has opening into a smaller glass tube, .l. and the tube, rl, is connected to the stopcoclrl l). The purpose of the stop-cock l) is to check the [low of liquid from the glass tube .l to the glass tube H,- the two tubes being intersected by the stop-cock D, as shown in theaccom nlnying drawing.

G is the scale placed behind the glass tube "E-and its use. is to facilitate the reading of any change in the volume of liquid contained inthe said tube, though the glass tube E may be graduated, so as to "record any change in the liquid.

I In operating the'said apparatus, I fill the reservoir B approximately three-fourths full with a desired strength of aqueous sulfuric acid or other aqueous solution, and then tip the device back and forth, so as to allow.the liquid to run into and completely fill the porcelain tube A and the reading tube E. When this-action is'accomplished the stopcock D is closed and the instrument may be rating power of, the air.

- The ob ect of the invention is to produce a humidity measuring instrument that will Heretofore, no satisfactory device has been the air under cold storage conditions and as of cold storage plants sustain much loss due to wrong conditionsof atmospheric moisture.- When the air is too dry in cold storage rooms it is deleterious to various prodncts, and when the air is too moist in such rooms, it is likewise injmrious to certain commodities. '.lherefore, it is the purpose of my invention to ali'ord a. means for de-' tecting and observing atmospheric humidity, in order that such conditions may be properly remedied, when necessary, so as to avoid i any harmful and injurious effects to the products in cold storage.

The nature, eharacteristics and scope of opening the stop-cock D the liquid may be at any desired point. The instrument is now complete and in a proper condition for being set in the room the humidity of which it is desired tocontrol. If the humidity is less than desired, the vapor pressure of the liqf hid in ,theinachine will be greater than the Y vapor pressure of the moisture in the air,

stood from the following description taken in connection with the accompanymg drawa front perspective View of the apparatus.

1 Referring tothe drawing, A represents a porous porcelain tube, having an' opening at {porcelain tube A. This action will cause a placed in a working position. By carefully drawn back into the reading tube E and set and evaporation will take plate from the negative movement of the liquid in the reading tube E, thereby indicating that more moisture should .be supplied the room. if the humidity of the room is greater than desired, the vapor pressure of the moisture in the air will be greater than the vapor pressure of the liquid in the instrument, and moisture will be; absorbed from the air by the liquid in the porcelain tube A. This remains stationary.

l-d'o not confine myself to the sole use of aqueous sulfuric acid in practicing my invention, but any other aqueous solution possessing similar properties may be used in obtaining the same desired-results.

Having thus described my invention, 1

claim:

1. apparatus havinga porcelain tube A, glass tubes H, J, E, and F, of small cir-.

cumference, and a glass tube, B, of large circumference with an opemn at its top for .receiving fluid and a stopper or closing said opening, the glass tubes F and E being arranged so as to connect'the'glass tube'B with the glass tube H, thereby permitting the How of fluid from onetube to the other, substantially as described.

2. An apparatus having a porcelain tube A, glass tubes H, J, E, and F, of small circumference, and a glass tube, B, of large p circumference'with an openin at its top for receiving fluid and a stopper or closing said ranged opening, the glass tubes F and E being arwith the glass tube, H, thereby permitting the flow of fluid from one tube to the other, and a stop-cock toregulate such flow, substantially as specified.

3. An apparatus having a porcelain tube A, glass tubes H, J, E, and F, of small circumference, and a glass tube, B, of large circumference with an opening at its top for receiving fluid and a stopper for closing said opening, a (stop-cock intersecting the glass tubes J and H, and the glass tube J being arranged so as to connect the glass tube 13 with the tube H, thereby permitting the flow of fluid from one tube to the other, substantially as specified.

4:. An apparatus having a porcelain tube A, glass tubes H, J, E, and F, of small circumference, and a glass tube, B, of large circumference with an opening at its top for receiving'fluid and a stopper tor closing said opening, the tubes F and. E being arranged so as to connect the-tube, B, with the tube, H, thereby permitting the flow of fiuid from one tube to the other, and the tubes containing fiuid'for determining the evaporatin power of air, and a scale plate provider with graduations for indicating variations in the volume of said fiuid'whereby the humidity of the air may be determined, substantially as specified.

In testimony whereof I afiix my signature v in the-presence of two subscribed witnesses.

MILO M. HASTINGS.

so as to connect the glass tube, B, 

